SEATTLE – On three weeks’ notice, Nam Phan bit off more than he could chew, and Dennis Siver capitalized.

Three rounds of dominant kickboxing and wrestling put a unanimous decision in the German’s corner with scores of 30-24, 30-25 and 30-26.

The featherweight bout was part of the preliminary card of Saturday’s UFC on FOX 5 event at Seattle’s KeyArena. It aired on FX following an additional prelim on Facebook and ahead of the main card on FOX.

Phan, who replaced an injured Eddie Yagin, worked to close the distance early, no doubt to unload his trademark body shots, but he was delayed by the active kicking of Siver, who landed to the body with a kick early.

Worse for Phan, Siver found his range inside, being first to strike in exchanges. Siver’s straight right and left hook did damage, though Phan kept coming after every shot. But the sheer volume of combinations stopped him in his tracks.

Flexing his power, Siver grabbed a leg with one-and-a-half minutes left in the first round and threw Phan to the canvas. The German’s trademark spinning back quick found its target twice.

Phan worked again to establish his jab, but was countered again by the far more active Siver, who led 31-4 in power strikes one minute into the second. A punch briefly dropped Phan.

Switching things up, Siver easily took the fight down and worked punches and elbows from guard. Phan had to fight from getting trapped in a near-crucifix position as Siver used his leg to trap Phan’s arm. Big shots rained down on the Vietnamese-born fighter. Siver advanced yet again, briefly taking mount, but Phan escaped.

By the end of the second, it was clear Phan would need to finish Siver to win the fight.

Instead, Siver took the fight down early in the third and imposed his will. Phan was almost entirely defensive as his opponent worked to advance by stinging him with punches. A series of left hands and elbows brought immediate reaction from the crowd. Siver again trapped Phan’s arm with his knee. Phan wasn’t going anywhere.

“We analyzed all of Nam’s fights before entering the octagon tonight,” Siver said. “We saw that he can’t handle much pressure, so we planned to push the pace from the opening bell until the final seconds. We planned to take him down and try to hurt him with the spinning back kicks, but they didn’t work as well as we thought they would. I want to prove that I’m the best fighter in the world at 145 pounds. I would like to fight another top contender and then fight for the title next year.”

Siver (21-8 MMA, 10-5 UFC) improved to 2-0 as a featherweight while Phan (18-11 MMA, 2-4 UFC) goes back to the drawing board following a split call over Cole Miller at UFC on FOX 4. At 2-4 inside the octagon, his big-show career is in jeopardy.